#!/usr/bin/env ruby

require 'net/http'
require 'json'
require 'cgi'

module Omnibus
  PROJECT_PATH = 'gitlab-org/omnibus-gitlab'.freeze

  class Trigger
    TOKEN = ENV['BUILD_TRIGGER_TOKEN']

    def initialize
      @uri = URI("https://gitlab.com/api/v4/projects/#{CGI.escape(Omnibus::PROJECT_PATH)}/trigger/pipeline")
      @params = env_params.merge(file_params).merge(token: TOKEN)
    end

    def invoke!
      res = Net::HTTP.post_form(@uri, @params)
      id = JSON.parse(res.body)['id']

      if id
        puts "Triggered https://gitlab.com/#{Omnibus::PROJECT_PATH}/pipelines/#{id}"
        puts "Waiting for downstream pipeline status"
      else
        raise "Trigger failed! The response from the trigger is: #{res.body}"
      end

      Omnibus::Pipeline.new(id)
    end

    private

    def ee?
      File.exist?('CHANGELOG-EE.md')
    end

    def env_params
      {
        "ref" => ENV["OMNIBUS_BRANCH"] || "master",
        "variables[GITLAB_VERSION]" => ENV["CI_COMMIT_SHA"],
        "variables[ALTERNATIVE_SOURCES]" => true,
        "variables[ee]" => ee? ? 'true' : 'false',
        "variables[TRIGGERED_USER]" => ENV["GITLAB_USER_NAME"],
        "variables[TRIGGER_SOURCE]" => "https://gitlab.com/gitlab-org/#{ENV['CI_PROJECT_NAME']}/-/jobs/#{ENV['CI_JOB_ID']}"
      }
    end

    def file_params
      Hash.new.tap do |params|
        Dir.glob("*_VERSION").each do |version_file|
          params["variables[#{version_file}]"] = File.read(version_file).strip
        end
      end
    end
  end

  class Pipeline
    INTERVAL = 60 # seconds
    MAX_DURATION = 3600 * 3 # 3 hours

    def initialize(id)
      @start = Time.now.to_i
      @uri = URI("https://gitlab.com/api/v4/projects/#{CGI.escape(Omnibus::PROJECT_PATH)}/pipelines/#{id}")
    end

    def wait!
      loop do
        raise "Pipeline timed out after waiting for #{duration} minutes!" if timeout?

        case status
        when :created, :pending, :running
          print "."
          sleep INTERVAL
        when :success
          puts "Omnibus pipeline succeeded in #{duration} minutes!"
          break
        else
          raise "Omnibus pipeline did not succeed!"
        end

        STDOUT.flush
      end
    end

    def timeout?
      Time.now.to_i > (@start + MAX_DURATION)
    end

    def duration
      (Time.now.to_i - @start) / 60
    end

    def status
      req = Net::HTTP::Get.new(@uri)
      req['PRIVATE-TOKEN'] = ENV['GITLAB_QA_ACCESS_TOKEN']

      res = Net::HTTP.start(@uri.hostname, @uri.port, use_ssl: true) do |http|
        http.request(req)
      end

      JSON.parse(res.body)['status'].to_s.to_sym
    end
  end
end

Omnibus::Trigger.new.invoke!.wait!
